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CryptCheck vs CheckTLS: catalog facts
CryptCheck	CheckTLS
Free Free to use in the browser.	Freemium Basic tests are available to visitors; batch, monitoring and other features need a paid…
Web	Web
Checks HTTPS, SMTP and XMPP servers Detailed protocol and cipher information	Shows the full SMTP conversation step by step Tests TLS without sending a real email
Interface is in French Little documentation on the home page	Cluttered interface with many menus Advanced features require a subscription
Web application	Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.